It has become very popular in the last few years to perform Olympic lifts for high repetitions rather than what they are meant for, (to be explosive and powerful). The problem is that when these lifts begin to be used for endurance instead of power, form is way too often sacrificed nullifying the positive effects and in many cases leading to injure. The worst is when a novice is taught this method of training. It takes years of practice and countless amounts of training, repetitions, and even going over partial movements before an individual can master the technique. When a trainer starts having a beginner perform high reps that lifter is robbed of opportunity to grasp the concept, to build explosive power, and to fully cultivate their athleticism.
I do on the other hand understand the desire to perform high repetition lifts such as snatches, cleans, and c&j’s. These workouts would definitely increase your metabolic demand, giving you a high intensity workout in a short period of time, along with increasing your power endurance. All are great things but I warn you to use extreme caution. A strong base should be established, and an understanding of how and why to perform these lifts.
Olympic lifts are extremely taxing on the central nervous system and should be taught in a responsible manner. Having an individual who has not mastered the technique attempting multiple reps (anything over 5-6) is insane and not responsible in the least. Think about this; if your form is poor to begin with, it is only going to get worse as fatigue increases.
In my opinion a better approach to train power endurance would be the use of kettlebells. Kettlebells are easier to teach, easier to learn, and the benefits can mimic that of the Olympic lifts. For novice I still recommend taking the time to become very efficient prior to performing high reps. If you really want to use the Olympic bar I advise going from the hang position rather than placing the bar on the floor. This is easier to learn and there is less of a chance of hurting your lower back with this technique. Also if you are to perform these lifts it is best to do so under the supervision of a strength coach when learning.
Good luck and keep working.